Optical recording medium and process for producing the same, data recording method and data reproducing method for optical recording medium
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example 1
[0097] An optical recording medium sample having the same structure as the optical recording medium 10 shown in FIG. 1 was prepared in the following manner.
[0098] To begin with, a disk-shaped supporting substrate 11 made from polycarbonate, measuring about 1.1 mm in thickness and about 120 mm in diameter, and having a groove 11a and a land 11b formed on the surface was prepared in accordance with an injection molding method.
[0099] Next this supporting substrate 11 was set in a sputtering apparatus and, on the groove 11a- and land 11b-formed side of the substrate, an about 20 nm-thick reflective layer 21 constituted substantially of platinum (Pt), an about 100 nm-thick dielectric layer 33 constituted substantially of a mixture of ZnS and SiO2 (molar ratio=about 80:20), an about 20 nm-thick light absorption layer 22 constituted substantially of a material represented by Sb74.1Te25.9 (wherein the numerical subscripts are expressed in mole %, and the same goes hereinafter exclusive of...
example 2
[0102] An optical recording medium sample according to Example 2 was prepared in the same manner as the optical recording medium sample according to Example 1, except that the thickness of the light absorption layer 22 was set at about 60 nm.
example 3
[0103] An optical recording medium sample according to Example 3 was prepared in the same manner as the optical recording medium sample according to Example 1, except that the material represented by Ge6.5 Sb73.5Te18.0Tb2.0 was used as the material for the light absorption layer 22.
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